1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
30 * Use is subject to license terms.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/obdclass/genops.c
38 * These are the only exported functions, they provide some generic
39 * infrastructure for managing object devices
42 #define DEBUG_SUBSYSTEM S_CLASS
44 #include <liblustre.h>
47 #include <obd_class.h>
48 #include <lprocfs_status.h>
50 extern cfs_list_t obd_types;
51 cfs_spinlock_t obd_types_lock;
53 cfs_mem_cache_t *obd_device_cachep;
54 cfs_mem_cache_t *obdo_cachep;
55 EXPORT_SYMBOL(obdo_cachep);
56 cfs_mem_cache_t *import_cachep;
58 cfs_list_t obd_zombie_imports;
59 cfs_list_t obd_zombie_exports;
60 cfs_spinlock_t obd_zombie_impexp_lock;
61 static void obd_zombie_impexp_notify(void);
62 static void obd_zombie_export_add(struct obd_export *exp);
63 static void obd_zombie_import_add(struct obd_import *imp);
64 static void print_export_data(struct obd_export *exp,
65 const char *status, int locks);
67 int (*ptlrpc_put_connection_superhack)(struct ptlrpc_connection *c);
70 * support functions: we could use inter-module communication, but this
71 * is more portable to other OS's
73 static struct obd_device *obd_device_alloc(void)
75 struct obd_device *obd;
77 OBD_SLAB_ALLOC_PTR_GFP(obd, obd_device_cachep, CFS_ALLOC_IO);
79 obd->obd_magic = OBD_DEVICE_MAGIC;
83 EXPORT_SYMBOL(obd_device_alloc);
85 static void obd_device_free(struct obd_device *obd)
88 LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC, "obd %p obd_magic %08x != %08x\n",
89 obd, obd->obd_magic, OBD_DEVICE_MAGIC);
90 if (obd->obd_namespace != NULL) {
91 CERROR("obd %p: namespace %p was not properly cleaned up (obd_force=%d)!\n",
92 obd, obd->obd_namespace, obd->obd_force);
95 lu_ref_fini(&obd->obd_reference);
96 OBD_SLAB_FREE_PTR(obd, obd_device_cachep);
99 struct obd_type *class_search_type(const char *name)
102 struct obd_type *type;
104 cfs_spin_lock(&obd_types_lock);
105 cfs_list_for_each(tmp, &obd_types) {
106 type = cfs_list_entry(tmp, struct obd_type, typ_chain);
107 if (strcmp(type->typ_name, name) == 0) {
108 cfs_spin_unlock(&obd_types_lock);
112 cfs_spin_unlock(&obd_types_lock);
116 struct obd_type *class_get_type(const char *name)
118 struct obd_type *type = class_search_type(name);
120 #ifdef HAVE_MODULE_LOADING_SUPPORT
122 const char *modname = name;
123 if (!cfs_request_module("%s", modname)) {
124 CDEBUG(D_INFO, "Loaded module '%s'\n", modname);
125 type = class_search_type(name);
127 LCONSOLE_ERROR_MSG(0x158, "Can't load module '%s'\n",
133 cfs_spin_lock(&type->obd_type_lock);
135 cfs_try_module_get(type->typ_dt_ops->o_owner);
136 cfs_spin_unlock(&type->obd_type_lock);
141 void class_put_type(struct obd_type *type)
144 cfs_spin_lock(&type->obd_type_lock);
146 cfs_module_put(type->typ_dt_ops->o_owner);
147 cfs_spin_unlock(&type->obd_type_lock);
150 #define CLASS_MAX_NAME 1024
152 int class_register_type(struct obd_ops *dt_ops, struct md_ops *md_ops,
153 struct lprocfs_vars *vars, const char *name,
154 struct lu_device_type *ldt)
156 struct obd_type *type;
161 LASSERT(strnlen(name, CLASS_MAX_NAME) < CLASS_MAX_NAME);
163 if (class_search_type(name)) {
164 CDEBUG(D_IOCTL, "Type %s already registered\n", name);
169 OBD_ALLOC(type, sizeof(*type));
173 OBD_ALLOC_PTR(type->typ_dt_ops);
174 OBD_ALLOC_PTR(type->typ_md_ops);
175 OBD_ALLOC(type->typ_name, strlen(name) + 1);
177 if (type->typ_dt_ops == NULL ||
178 type->typ_md_ops == NULL ||
179 type->typ_name == NULL)
182 *(type->typ_dt_ops) = *dt_ops;
183 /* md_ops is optional */
185 *(type->typ_md_ops) = *md_ops;
186 strcpy(type->typ_name, name);
187 cfs_spin_lock_init(&type->obd_type_lock);
190 type->typ_procroot = lprocfs_register(type->typ_name, proc_lustre_root,
192 if (IS_ERR(type->typ_procroot)) {
193 rc = PTR_ERR(type->typ_procroot);
194 type->typ_procroot = NULL;
200 rc = lu_device_type_init(ldt);
205 cfs_spin_lock(&obd_types_lock);
206 cfs_list_add(&type->typ_chain, &obd_types);
207 cfs_spin_unlock(&obd_types_lock);
212 if (type->typ_name != NULL)
213 OBD_FREE(type->typ_name, strlen(name) + 1);
214 if (type->typ_md_ops != NULL)
215 OBD_FREE_PTR(type->typ_md_ops);
216 if (type->typ_dt_ops != NULL)
217 OBD_FREE_PTR(type->typ_dt_ops);
218 OBD_FREE(type, sizeof(*type));
222 int class_unregister_type(const char *name)
224 struct obd_type *type = class_search_type(name);
228 CERROR("unknown obd type\n");
232 if (type->typ_refcnt) {
233 CERROR("type %s has refcount (%d)\n", name, type->typ_refcnt);
234 /* This is a bad situation, let's make the best of it */
235 /* Remove ops, but leave the name for debugging */
236 OBD_FREE_PTR(type->typ_dt_ops);
237 OBD_FREE_PTR(type->typ_md_ops);
241 if (type->typ_procroot) {
242 lprocfs_remove(&type->typ_procroot);
246 lu_device_type_fini(type->typ_lu);
248 cfs_spin_lock(&obd_types_lock);
249 cfs_list_del(&type->typ_chain);
250 cfs_spin_unlock(&obd_types_lock);
251 OBD_FREE(type->typ_name, strlen(name) + 1);
252 if (type->typ_dt_ops != NULL)
253 OBD_FREE_PTR(type->typ_dt_ops);
254 if (type->typ_md_ops != NULL)
255 OBD_FREE_PTR(type->typ_md_ops);
256 OBD_FREE(type, sizeof(*type));
258 } /* class_unregister_type */
261 * Create a new obd device.
263 * Find an empty slot in ::obd_devs[], create a new obd device in it.
265 * \param[in] type_name obd device type string.
266 * \param[in] name obd device name.
268 * \retval NULL if create fails, otherwise return the obd device
271 struct obd_device *class_newdev(const char *type_name, const char *name)
273 struct obd_device *result = NULL;
274 struct obd_device *newdev;
275 struct obd_type *type = NULL;
277 int new_obd_minor = 0;
279 if (strlen(name) >= MAX_OBD_NAME) {
280 CERROR("name/uuid must be < %u bytes long\n", MAX_OBD_NAME);
281 RETURN(ERR_PTR(-EINVAL));
284 type = class_get_type(type_name);
286 CERROR("OBD: unknown type: %s\n", type_name);
287 RETURN(ERR_PTR(-ENODEV));
290 newdev = obd_device_alloc();
291 if (newdev == NULL) {
292 class_put_type(type);
293 RETURN(ERR_PTR(-ENOMEM));
295 LASSERT(newdev->obd_magic == OBD_DEVICE_MAGIC);
297 cfs_spin_lock(&obd_dev_lock);
298 for (i = 0; i < class_devno_max(); i++) {
299 struct obd_device *obd = class_num2obd(i);
300 if (obd && obd->obd_name &&
301 (strcmp(name, obd->obd_name) == 0)) {
302 CERROR("Device %s already exists, won't add\n", name);
304 LASSERTF(result->obd_magic == OBD_DEVICE_MAGIC,
305 "%p obd_magic %08x != %08x\n", result,
306 result->obd_magic, OBD_DEVICE_MAGIC);
307 LASSERTF(result->obd_minor == new_obd_minor,
308 "%p obd_minor %d != %d\n", result,
309 result->obd_minor, new_obd_minor);
311 obd_devs[result->obd_minor] = NULL;
312 result->obd_name[0]='\0';
314 result = ERR_PTR(-EEXIST);
317 if (!result && !obd) {
319 result->obd_minor = i;
321 result->obd_type = type;
322 strncpy(result->obd_name, name,
323 sizeof(result->obd_name) - 1);
324 obd_devs[i] = result;
327 cfs_spin_unlock(&obd_dev_lock);
329 if (result == NULL && i >= class_devno_max()) {
330 CERROR("all %u OBD devices used, increase MAX_OBD_DEVICES\n",
332 result = ERR_PTR(-EOVERFLOW);
335 if (IS_ERR(result)) {
336 obd_device_free(newdev);
337 class_put_type(type);
339 CDEBUG(D_IOCTL, "Adding new device %s (%p)\n",
340 result->obd_name, result);
345 void class_release_dev(struct obd_device *obd)
347 struct obd_type *obd_type = obd->obd_type;
349 LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC, "%p obd_magic %08x != %08x\n",
350 obd, obd->obd_magic, OBD_DEVICE_MAGIC);
351 LASSERTF(obd == obd_devs[obd->obd_minor], "obd %p != obd_devs[%d] %p\n",
352 obd, obd->obd_minor, obd_devs[obd->obd_minor]);
353 LASSERT(obd_type != NULL);
355 CDEBUG(D_INFO, "Release obd device %s obd_type name =%s\n",
356 obd->obd_name,obd->obd_type->typ_name);
358 cfs_spin_lock(&obd_dev_lock);
359 obd_devs[obd->obd_minor] = NULL;
360 cfs_spin_unlock(&obd_dev_lock);
361 obd_device_free(obd);
363 class_put_type(obd_type);
366 int class_name2dev(const char *name)
373 cfs_spin_lock(&obd_dev_lock);
374 for (i = 0; i < class_devno_max(); i++) {
375 struct obd_device *obd = class_num2obd(i);
376 if (obd && obd->obd_name && strcmp(name, obd->obd_name) == 0) {
377 /* Make sure we finished attaching before we give
378 out any references */
379 LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
380 if (obd->obd_attached) {
381 cfs_spin_unlock(&obd_dev_lock);
387 cfs_spin_unlock(&obd_dev_lock);
392 struct obd_device *class_name2obd(const char *name)
394 int dev = class_name2dev(name);
396 if (dev < 0 || dev > class_devno_max())
398 return class_num2obd(dev);
401 int class_uuid2dev(struct obd_uuid *uuid)
405 cfs_spin_lock(&obd_dev_lock);
406 for (i = 0; i < class_devno_max(); i++) {
407 struct obd_device *obd = class_num2obd(i);
408 if (obd && obd_uuid_equals(uuid, &obd->obd_uuid)) {
409 LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
410 cfs_spin_unlock(&obd_dev_lock);
414 cfs_spin_unlock(&obd_dev_lock);
419 struct obd_device *class_uuid2obd(struct obd_uuid *uuid)
421 int dev = class_uuid2dev(uuid);
424 return class_num2obd(dev);
428 * Get obd device from ::obd_devs[]
430 * \param num [in] array index
432 * \retval NULL if ::obd_devs[\a num] does not contains an obd device
433 * otherwise return the obd device there.
435 struct obd_device *class_num2obd(int num)
437 struct obd_device *obd = NULL;
439 if (num < class_devno_max()) {
444 LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC,
445 "%p obd_magic %08x != %08x\n",
446 obd, obd->obd_magic, OBD_DEVICE_MAGIC);
447 LASSERTF(obd->obd_minor == num,
448 "%p obd_minor %0d != %0d\n",
449 obd, obd->obd_minor, num);
455 void class_obd_list(void)
460 cfs_spin_lock(&obd_dev_lock);
461 for (i = 0; i < class_devno_max(); i++) {
462 struct obd_device *obd = class_num2obd(i);
465 if (obd->obd_stopping)
467 else if (obd->obd_set_up)
469 else if (obd->obd_attached)
473 LCONSOLE(D_CONFIG, "%3d %s %s %s %s %d\n",
474 i, status, obd->obd_type->typ_name,
475 obd->obd_name, obd->obd_uuid.uuid,
476 cfs_atomic_read(&obd->obd_refcount));
478 cfs_spin_unlock(&obd_dev_lock);
482 /* Search for a client OBD connected to tgt_uuid. If grp_uuid is
483 specified, then only the client with that uuid is returned,
484 otherwise any client connected to the tgt is returned. */
485 struct obd_device * class_find_client_obd(struct obd_uuid *tgt_uuid,
486 const char * typ_name,
487 struct obd_uuid *grp_uuid)
491 cfs_spin_lock(&obd_dev_lock);
492 for (i = 0; i < class_devno_max(); i++) {
493 struct obd_device *obd = class_num2obd(i);
496 if ((strncmp(obd->obd_type->typ_name, typ_name,
497 strlen(typ_name)) == 0)) {
498 if (obd_uuid_equals(tgt_uuid,
499 &obd->u.cli.cl_target_uuid) &&
500 ((grp_uuid)? obd_uuid_equals(grp_uuid,
501 &obd->obd_uuid) : 1)) {
502 cfs_spin_unlock(&obd_dev_lock);
507 cfs_spin_unlock(&obd_dev_lock);
512 /* Iterate the obd_device list looking devices have grp_uuid. Start
513 searching at *next, and if a device is found, the next index to look
514 at is saved in *next. If next is NULL, then the first matching device
515 will always be returned. */
516 struct obd_device * class_devices_in_group(struct obd_uuid *grp_uuid, int *next)
522 else if (*next >= 0 && *next < class_devno_max())
527 cfs_spin_lock(&obd_dev_lock);
528 for (; i < class_devno_max(); i++) {
529 struct obd_device *obd = class_num2obd(i);
532 if (obd_uuid_equals(grp_uuid, &obd->obd_uuid)) {
535 cfs_spin_unlock(&obd_dev_lock);
539 cfs_spin_unlock(&obd_dev_lock);
545 * to notify sptlrpc log for \a fsname has changed, let every relevant OBD
546 * adjust sptlrpc settings accordingly.
548 int class_notify_sptlrpc_conf(const char *fsname, int namelen)
550 struct obd_device *obd;
554 LASSERT(namelen > 0);
556 cfs_spin_lock(&obd_dev_lock);
557 for (i = 0; i < class_devno_max(); i++) {
558 obd = class_num2obd(i);
560 if (obd == NULL || obd->obd_set_up == 0 || obd->obd_stopping)
563 /* only notify mdc, osc, mdt, ost */
564 type = obd->obd_type->typ_name;
565 if (strcmp(type, LUSTRE_MDC_NAME) != 0 &&
566 strcmp(type, LUSTRE_OSC_NAME) != 0 &&
567 strcmp(type, LUSTRE_MDT_NAME) != 0 &&
568 strcmp(type, LUSTRE_OST_NAME) != 0)
571 if (strncmp(obd->obd_name, fsname, namelen))
574 class_incref(obd, __FUNCTION__, obd);
575 cfs_spin_unlock(&obd_dev_lock);
576 rc2 = obd_set_info_async(obd->obd_self_export,
577 sizeof(KEY_SPTLRPC_CONF),
578 KEY_SPTLRPC_CONF, 0, NULL, NULL);
580 class_decref(obd, __FUNCTION__, obd);
581 cfs_spin_lock(&obd_dev_lock);
583 cfs_spin_unlock(&obd_dev_lock);
586 EXPORT_SYMBOL(class_notify_sptlrpc_conf);
588 void obd_cleanup_caches(void)
593 if (obd_device_cachep) {
594 rc = cfs_mem_cache_destroy(obd_device_cachep);
595 LASSERTF(rc == 0, "Cannot destropy ll_obd_device_cache: rc %d\n", rc);
596 obd_device_cachep = NULL;
599 rc = cfs_mem_cache_destroy(obdo_cachep);
600 LASSERTF(rc == 0, "Cannot destory ll_obdo_cache\n");
604 rc = cfs_mem_cache_destroy(import_cachep);
605 LASSERTF(rc == 0, "Cannot destory ll_import_cache\n");
606 import_cachep = NULL;
609 rc = cfs_mem_cache_destroy(capa_cachep);
610 LASSERTF(rc == 0, "Cannot destory capa_cache\n");
616 int obd_init_caches(void)
620 LASSERT(obd_device_cachep == NULL);
621 obd_device_cachep = cfs_mem_cache_create("ll_obd_dev_cache",
622 sizeof(struct obd_device),
624 if (!obd_device_cachep)
627 LASSERT(obdo_cachep == NULL);
628 obdo_cachep = cfs_mem_cache_create("ll_obdo_cache", sizeof(struct obdo),
633 LASSERT(import_cachep == NULL);
634 import_cachep = cfs_mem_cache_create("ll_import_cache",
635 sizeof(struct obd_import),
640 LASSERT(capa_cachep == NULL);
641 capa_cachep = cfs_mem_cache_create("capa_cache",
642 sizeof(struct obd_capa), 0, 0);
648 obd_cleanup_caches();
653 /* map connection to client */
654 struct obd_export *class_conn2export(struct lustre_handle *conn)
656 struct obd_export *export;
660 CDEBUG(D_CACHE, "looking for null handle\n");
664 if (conn->cookie == -1) { /* this means assign a new connection */
665 CDEBUG(D_CACHE, "want a new connection\n");
669 CDEBUG(D_INFO, "looking for export cookie "LPX64"\n", conn->cookie);
670 export = class_handle2object(conn->cookie);
674 struct obd_device *class_exp2obd(struct obd_export *exp)
681 struct obd_device *class_conn2obd(struct lustre_handle *conn)
683 struct obd_export *export;
684 export = class_conn2export(conn);
686 struct obd_device *obd = export->exp_obd;
687 class_export_put(export);
693 struct obd_import *class_exp2cliimp(struct obd_export *exp)
695 struct obd_device *obd = exp->exp_obd;
698 return obd->u.cli.cl_import;
701 struct obd_import *class_conn2cliimp(struct lustre_handle *conn)
703 struct obd_device *obd = class_conn2obd(conn);
706 return obd->u.cli.cl_import;
709 /* Export management functions */
710 static void class_export_destroy(struct obd_export *exp)
712 struct obd_device *obd = exp->exp_obd;
715 LASSERT (cfs_atomic_read(&exp->exp_refcount) == 0);
717 CDEBUG(D_IOCTL, "destroying export %p/%s for %s\n", exp,
718 exp->exp_client_uuid.uuid, obd->obd_name);
720 LASSERT(obd != NULL);
722 /* "Local" exports (lctl, LOV->{mdc,osc}) have no connection. */
723 if (exp->exp_connection)
724 ptlrpc_put_connection_superhack(exp->exp_connection);
726 LASSERT(cfs_list_empty(&exp->exp_outstanding_replies));
727 LASSERT(cfs_list_empty(&exp->exp_uncommitted_replies));
728 LASSERT(cfs_list_empty(&exp->exp_req_replay_queue));
729 LASSERT(cfs_list_empty(&exp->exp_queued_rpc));
730 obd_destroy_export(exp);
731 class_decref(obd, "export", exp);
733 OBD_FREE_RCU(exp, sizeof(*exp), &exp->exp_handle);
737 static void export_handle_addref(void *export)
739 class_export_get(export);
742 struct obd_export *class_export_get(struct obd_export *exp)
744 cfs_atomic_inc(&exp->exp_refcount);
745 CDEBUG(D_INFO, "GETting export %p : new refcount %d\n", exp,
746 cfs_atomic_read(&exp->exp_refcount));
749 EXPORT_SYMBOL(class_export_get);
751 void class_export_put(struct obd_export *exp)
753 LASSERT(exp != NULL);
754 CDEBUG(D_INFO, "PUTting export %p : new refcount %d\n", exp,
755 cfs_atomic_read(&exp->exp_refcount) - 1);
756 LASSERT(cfs_atomic_read(&exp->exp_refcount) > 0);
757 LASSERT(cfs_atomic_read(&exp->exp_refcount) < 0x5a5a5a);
759 if (cfs_atomic_dec_and_test(&exp->exp_refcount)) {
760 LASSERT(!cfs_list_empty(&exp->exp_obd_chain));
761 CDEBUG(D_IOCTL, "final put %p/%s\n",
762 exp, exp->exp_client_uuid.uuid);
763 obd_zombie_export_add(exp);
766 EXPORT_SYMBOL(class_export_put);
768 /* Creates a new export, adds it to the hash table, and returns a
769 * pointer to it. The refcount is 2: one for the hash reference, and
770 * one for the pointer returned by this function. */
771 struct obd_export *class_new_export(struct obd_device *obd,
772 struct obd_uuid *cluuid)
774 struct obd_export *export;
775 cfs_hash_t *hash = NULL;
779 OBD_ALLOC_PTR(export);
781 return ERR_PTR(-ENOMEM);
783 export->exp_conn_cnt = 0;
784 export->exp_lock_hash = NULL;
785 cfs_atomic_set(&export->exp_refcount, 2);
786 cfs_atomic_set(&export->exp_rpc_count, 0);
787 cfs_atomic_set(&export->exp_cb_count, 0);
788 cfs_atomic_set(&export->exp_locks_count, 0);
789 #if LUSTRE_TRACKS_LOCK_EXP_REFS
790 CFS_INIT_LIST_HEAD(&export->exp_locks_list);
791 cfs_spin_lock_init(&export->exp_locks_list_guard);
793 cfs_atomic_set(&export->exp_replay_count, 0);
794 export->exp_obd = obd;
795 CFS_INIT_LIST_HEAD(&export->exp_outstanding_replies);
796 cfs_spin_lock_init(&export->exp_uncommitted_replies_lock);
797 CFS_INIT_LIST_HEAD(&export->exp_uncommitted_replies);
798 CFS_INIT_LIST_HEAD(&export->exp_req_replay_queue);
799 CFS_INIT_LIST_HEAD(&export->exp_handle.h_link);
800 CFS_INIT_LIST_HEAD(&export->exp_queued_rpc);
801 class_handle_hash(&export->exp_handle, export_handle_addref);
802 export->exp_last_request_time = cfs_time_current_sec();
803 cfs_spin_lock_init(&export->exp_lock);
804 CFS_INIT_HLIST_NODE(&export->exp_uuid_hash);
805 CFS_INIT_HLIST_NODE(&export->exp_nid_hash);
807 export->exp_sp_peer = LUSTRE_SP_ANY;
808 export->exp_flvr.sf_rpc = SPTLRPC_FLVR_INVALID;
809 export->exp_client_uuid = *cluuid;
810 obd_init_export(export);
812 cfs_spin_lock(&obd->obd_dev_lock);
813 /* shouldn't happen, but might race */
814 if (obd->obd_stopping)
815 GOTO(exit_unlock, rc = -ENODEV);
817 hash = cfs_hash_getref(obd->obd_uuid_hash);
819 GOTO(exit_unlock, rc = -ENODEV);
820 cfs_spin_unlock(&obd->obd_dev_lock);
822 if (!obd_uuid_equals(cluuid, &obd->obd_uuid)) {
823 rc = cfs_hash_add_unique(hash, cluuid, &export->exp_uuid_hash);
825 LCONSOLE_WARN("%s: denying duplicate export for %s, %d\n",
826 obd->obd_name, cluuid->uuid, rc);
827 GOTO(exit_err, rc = -EALREADY);
831 cfs_spin_lock(&obd->obd_dev_lock);
832 if (obd->obd_stopping) {
833 cfs_hash_del(hash, cluuid, &export->exp_uuid_hash);
834 GOTO(exit_unlock, rc = -ENODEV);
837 class_incref(obd, "export", export);
838 cfs_list_add(&export->exp_obd_chain, &export->exp_obd->obd_exports);
839 cfs_list_add_tail(&export->exp_obd_chain_timed,
840 &export->exp_obd->obd_exports_timed);
841 export->exp_obd->obd_num_exports++;
842 cfs_spin_unlock(&obd->obd_dev_lock);
843 cfs_hash_putref(hash);
847 cfs_spin_unlock(&obd->obd_dev_lock);
850 cfs_hash_putref(hash);
851 class_handle_unhash(&export->exp_handle);
852 LASSERT(cfs_hlist_unhashed(&export->exp_uuid_hash));
853 obd_destroy_export(export);
854 OBD_FREE_PTR(export);
857 EXPORT_SYMBOL(class_new_export);
859 void class_unlink_export(struct obd_export *exp)
861 class_handle_unhash(&exp->exp_handle);
863 cfs_spin_lock(&exp->exp_obd->obd_dev_lock);
864 /* delete an uuid-export hashitem from hashtables */
865 if (!cfs_hlist_unhashed(&exp->exp_uuid_hash))
866 cfs_hash_del(exp->exp_obd->obd_uuid_hash,
867 &exp->exp_client_uuid,
868 &exp->exp_uuid_hash);
870 cfs_list_move(&exp->exp_obd_chain, &exp->exp_obd->obd_unlinked_exports);
871 cfs_list_del_init(&exp->exp_obd_chain_timed);
872 exp->exp_obd->obd_num_exports--;
873 cfs_spin_unlock(&exp->exp_obd->obd_dev_lock);
874 class_export_put(exp);
876 EXPORT_SYMBOL(class_unlink_export);
878 /* Import management functions */
879 void class_import_destroy(struct obd_import *imp)
883 CDEBUG(D_IOCTL, "destroying import %p for %s\n", imp,
884 imp->imp_obd->obd_name);
886 LASSERT(cfs_atomic_read(&imp->imp_refcount) == 0);
888 ptlrpc_put_connection_superhack(imp->imp_connection);
890 while (!cfs_list_empty(&imp->imp_conn_list)) {
891 struct obd_import_conn *imp_conn;
893 imp_conn = cfs_list_entry(imp->imp_conn_list.next,
894 struct obd_import_conn, oic_item);
895 cfs_list_del_init(&imp_conn->oic_item);
896 ptlrpc_put_connection_superhack(imp_conn->oic_conn);
897 OBD_FREE(imp_conn, sizeof(*imp_conn));
900 LASSERT(imp->imp_sec == NULL);
901 class_decref(imp->imp_obd, "import", imp);
902 OBD_FREE_RCU(imp, sizeof(*imp), &imp->imp_handle);
906 static void import_handle_addref(void *import)
908 class_import_get(import);
911 struct obd_import *class_import_get(struct obd_import *import)
913 LASSERT(cfs_atomic_read(&import->imp_refcount) >= 0);
914 LASSERT(cfs_atomic_read(&import->imp_refcount) < 0x5a5a5a);
915 cfs_atomic_inc(&import->imp_refcount);
916 CDEBUG(D_INFO, "import %p refcount=%d obd=%s\n", import,
917 cfs_atomic_read(&import->imp_refcount),
918 import->imp_obd->obd_name);
921 EXPORT_SYMBOL(class_import_get);
923 void class_import_put(struct obd_import *imp)
927 LASSERT(cfs_atomic_read(&imp->imp_refcount) > 0);
928 LASSERT(cfs_atomic_read(&imp->imp_refcount) < 0x5a5a5a);
929 LASSERT(cfs_list_empty(&imp->imp_zombie_chain));
931 CDEBUG(D_INFO, "import %p refcount=%d obd=%s\n", imp,
932 cfs_atomic_read(&imp->imp_refcount) - 1,
933 imp->imp_obd->obd_name);
935 if (cfs_atomic_dec_and_test(&imp->imp_refcount)) {
936 CDEBUG(D_INFO, "final put import %p\n", imp);
937 obd_zombie_import_add(imp);
942 EXPORT_SYMBOL(class_import_put);
944 static void init_imp_at(struct imp_at *at) {
946 at_init(&at->iat_net_latency, 0, 0);
947 for (i = 0; i < IMP_AT_MAX_PORTALS; i++) {
948 /* max service estimates are tracked on the server side, so
949 don't use the AT history here, just use the last reported
950 val. (But keep hist for proc histogram, worst_ever) */
951 at_init(&at->iat_service_estimate[i], INITIAL_CONNECT_TIMEOUT,
956 struct obd_import *class_new_import(struct obd_device *obd)
958 struct obd_import *imp;
960 OBD_ALLOC(imp, sizeof(*imp));
964 CFS_INIT_LIST_HEAD(&imp->imp_zombie_chain);
965 CFS_INIT_LIST_HEAD(&imp->imp_replay_list);
966 CFS_INIT_LIST_HEAD(&imp->imp_sending_list);
967 CFS_INIT_LIST_HEAD(&imp->imp_delayed_list);
968 cfs_spin_lock_init(&imp->imp_lock);
969 imp->imp_last_success_conn = 0;
970 imp->imp_state = LUSTRE_IMP_NEW;
971 imp->imp_obd = class_incref(obd, "import", imp);
972 cfs_sema_init(&imp->imp_sec_mutex, 1);
973 cfs_waitq_init(&imp->imp_recovery_waitq);
975 cfs_atomic_set(&imp->imp_refcount, 2);
976 cfs_atomic_set(&imp->imp_unregistering, 0);
977 cfs_atomic_set(&imp->imp_inflight, 0);
978 cfs_atomic_set(&imp->imp_replay_inflight, 0);
979 cfs_atomic_set(&imp->imp_inval_count, 0);
980 CFS_INIT_LIST_HEAD(&imp->imp_conn_list);
981 CFS_INIT_LIST_HEAD(&imp->imp_handle.h_link);
982 class_handle_hash(&imp->imp_handle, import_handle_addref);
983 init_imp_at(&imp->imp_at);
985 /* the default magic is V2, will be used in connect RPC, and
986 * then adjusted according to the flags in request/reply. */
987 imp->imp_msg_magic = LUSTRE_MSG_MAGIC_V2;
991 EXPORT_SYMBOL(class_new_import);
993 void class_destroy_import(struct obd_import *import)
995 LASSERT(import != NULL);
996 LASSERT(import != LP_POISON);
998 class_handle_unhash(&import->imp_handle);
1000 cfs_spin_lock(&import->imp_lock);
1001 import->imp_generation++;
1002 cfs_spin_unlock(&import->imp_lock);
1003 class_import_put(import);
1005 EXPORT_SYMBOL(class_destroy_import);
1007 #if LUSTRE_TRACKS_LOCK_EXP_REFS
1009 void __class_export_add_lock_ref(struct obd_export *exp, struct ldlm_lock *lock)
1011 cfs_spin_lock(&exp->exp_locks_list_guard);
1013 LASSERT(lock->l_exp_refs_nr >= 0);
1015 if (lock->l_exp_refs_target != NULL &&
1016 lock->l_exp_refs_target != exp) {
1017 LCONSOLE_WARN("setting export %p for lock %p which already has export %p\n",
1018 exp, lock, lock->l_exp_refs_target);
1020 if ((lock->l_exp_refs_nr ++) == 0) {
1021 cfs_list_add(&lock->l_exp_refs_link, &exp->exp_locks_list);
1022 lock->l_exp_refs_target = exp;
1024 CDEBUG(D_INFO, "lock = %p, export = %p, refs = %u\n",
1025 lock, exp, lock->l_exp_refs_nr);
1026 cfs_spin_unlock(&exp->exp_locks_list_guard);
1028 EXPORT_SYMBOL(__class_export_add_lock_ref);
1030 void __class_export_del_lock_ref(struct obd_export *exp, struct ldlm_lock *lock)
1032 cfs_spin_lock(&exp->exp_locks_list_guard);
1033 LASSERT(lock->l_exp_refs_nr > 0);
1034 if (lock->l_exp_refs_target != exp) {
1035 LCONSOLE_WARN("lock %p, "
1036 "mismatching export pointers: %p, %p\n",
1037 lock, lock->l_exp_refs_target, exp);
1039 if (-- lock->l_exp_refs_nr == 0) {
1040 cfs_list_del_init(&lock->l_exp_refs_link);
1041 lock->l_exp_refs_target = NULL;
1043 CDEBUG(D_INFO, "lock = %p, export = %p, refs = %u\n",
1044 lock, exp, lock->l_exp_refs_nr);
1045 cfs_spin_unlock(&exp->exp_locks_list_guard);
1047 EXPORT_SYMBOL(__class_export_del_lock_ref);
1050 /* A connection defines an export context in which preallocation can
1051 be managed. This releases the export pointer reference, and returns
1052 the export handle, so the export refcount is 1 when this function
1054 int class_connect(struct lustre_handle *conn, struct obd_device *obd,
1055 struct obd_uuid *cluuid)
1057 struct obd_export *export;
1058 LASSERT(conn != NULL);
1059 LASSERT(obd != NULL);
1060 LASSERT(cluuid != NULL);
1063 export = class_new_export(obd, cluuid);
1065 RETURN(PTR_ERR(export));
1067 conn->cookie = export->exp_handle.h_cookie;
1068 class_export_put(export);
1070 CDEBUG(D_IOCTL, "connect: client %s, cookie "LPX64"\n",
1071 cluuid->uuid, conn->cookie);
1074 EXPORT_SYMBOL(class_connect);
1076 /* if export is involved in recovery then clean up related things */
1077 void class_export_recovery_cleanup(struct obd_export *exp)
1079 struct obd_device *obd = exp->exp_obd;
1081 cfs_spin_lock_bh(&obd->obd_processing_task_lock);
1082 if (exp->exp_delayed)
1083 obd->obd_delayed_clients--;
1084 if (obd->obd_recovering && exp->exp_in_recovery) {
1085 cfs_spin_lock(&exp->exp_lock);
1086 exp->exp_in_recovery = 0;
1087 cfs_spin_unlock(&exp->exp_lock);
1088 LASSERT(obd->obd_connected_clients);
1089 obd->obd_connected_clients--;
1091 /** Cleanup req replay fields */
1092 if (exp->exp_req_replay_needed) {
1093 cfs_spin_lock(&exp->exp_lock);
1094 exp->exp_req_replay_needed = 0;
1095 cfs_spin_unlock(&exp->exp_lock);
1096 LASSERT(cfs_atomic_read(&obd->obd_req_replay_clients));
1097 cfs_atomic_dec(&obd->obd_req_replay_clients);
1099 /** Cleanup lock replay data */
1100 if (exp->exp_lock_replay_needed) {
1101 cfs_spin_lock(&exp->exp_lock);
1102 exp->exp_lock_replay_needed = 0;
1103 cfs_spin_unlock(&exp->exp_lock);
1104 LASSERT(cfs_atomic_read(&obd->obd_lock_replay_clients));
1105 cfs_atomic_dec(&obd->obd_lock_replay_clients);
1107 cfs_spin_unlock_bh(&obd->obd_processing_task_lock);
1110 /* This function removes 1-3 references from the export:
1111 * 1 - for export pointer passed
1112 * and if disconnect really need
1113 * 2 - removing from hash
1114 * 3 - in client_unlink_export
1115 * The export pointer passed to this function can destroyed */
1116 int class_disconnect(struct obd_export *export)
1118 int already_disconnected;
1121 if (export == NULL) {
1123 CDEBUG(D_IOCTL, "attempting to free NULL export %p\n", export);
1127 cfs_spin_lock(&export->exp_lock);
1128 already_disconnected = export->exp_disconnected;
1129 export->exp_disconnected = 1;
1130 cfs_spin_unlock(&export->exp_lock);
1132 /* class_cleanup(), abort_recovery(), and class_fail_export()
1133 * all end up in here, and if any of them race we shouldn't
1134 * call extra class_export_puts(). */
1135 if (already_disconnected) {
1136 LASSERT(cfs_hlist_unhashed(&export->exp_nid_hash));
1137 GOTO(no_disconn, already_disconnected);
1140 CDEBUG(D_IOCTL, "disconnect: cookie "LPX64"\n",
1141 export->exp_handle.h_cookie);
1143 if (!cfs_hlist_unhashed(&export->exp_nid_hash))
1144 cfs_hash_del(export->exp_obd->obd_nid_hash,
1145 &export->exp_connection->c_peer.nid,
1146 &export->exp_nid_hash);
1148 class_export_recovery_cleanup(export);
1149 class_unlink_export(export);
1151 class_export_put(export);
1155 /* Return non-zero for a fully connected export */
1156 int class_connected_export(struct obd_export *exp)
1160 cfs_spin_lock(&exp->exp_lock);
1161 connected = (exp->exp_conn_cnt > 0);
1162 cfs_spin_unlock(&exp->exp_lock);
1167 EXPORT_SYMBOL(class_connected_export);
1169 static void class_disconnect_export_list(cfs_list_t *list,
1170 enum obd_option flags)
1173 struct obd_export *exp;
1176 /* It's possible that an export may disconnect itself, but
1177 * nothing else will be added to this list. */
1178 while (!cfs_list_empty(list)) {
1179 exp = cfs_list_entry(list->next, struct obd_export,
1181 /* need for safe call CDEBUG after obd_disconnect */
1182 class_export_get(exp);
1184 cfs_spin_lock(&exp->exp_lock);
1185 exp->exp_flags = flags;
1186 cfs_spin_unlock(&exp->exp_lock);
1188 if (obd_uuid_equals(&exp->exp_client_uuid,
1189 &exp->exp_obd->obd_uuid)) {
1191 "exp %p export uuid == obd uuid, don't discon\n",
1193 /* Need to delete this now so we don't end up pointing
1194 * to work_list later when this export is cleaned up. */
1195 cfs_list_del_init(&exp->exp_obd_chain);
1196 class_export_put(exp);
1200 class_export_get(exp);
1201 CDEBUG(D_HA, "%s: disconnecting export at %s (%p), "
1202 "last request at "CFS_TIME_T"\n",
1203 exp->exp_obd->obd_name, obd_export_nid2str(exp),
1204 exp, exp->exp_last_request_time);
1205 /* release one export reference anyway */
1206 rc = obd_disconnect(exp);
1208 CDEBUG(D_HA, "disconnected export at %s (%p): rc %d\n",
1209 obd_export_nid2str(exp), exp, rc);
1210 class_export_put(exp);
1215 void class_disconnect_exports(struct obd_device *obd)
1217 cfs_list_t work_list;
1220 /* Move all of the exports from obd_exports to a work list, en masse. */
1221 CFS_INIT_LIST_HEAD(&work_list);
1222 cfs_spin_lock(&obd->obd_dev_lock);
1223 cfs_list_splice_init(&obd->obd_exports, &work_list);
1224 cfs_list_splice_init(&obd->obd_delayed_exports, &work_list);
1225 cfs_spin_unlock(&obd->obd_dev_lock);
1227 if (!cfs_list_empty(&work_list)) {
1228 CDEBUG(D_HA, "OBD device %d (%p) has exports, "
1229 "disconnecting them\n", obd->obd_minor, obd);
1230 class_disconnect_export_list(&work_list,
1231 exp_flags_from_obd(obd));
1233 CDEBUG(D_HA, "OBD device %d (%p) has no exports\n",
1234 obd->obd_minor, obd);
1237 EXPORT_SYMBOL(class_disconnect_exports);
1239 /* Remove exports that have not completed recovery.
1241 void class_disconnect_stale_exports(struct obd_device *obd,
1242 int (*test_export)(struct obd_export *))
1244 cfs_list_t work_list;
1245 cfs_list_t *pos, *n;
1246 struct obd_export *exp;
1250 CFS_INIT_LIST_HEAD(&work_list);
1251 cfs_spin_lock(&obd->obd_dev_lock);
1252 cfs_list_for_each_safe(pos, n, &obd->obd_exports) {
1253 exp = cfs_list_entry(pos, struct obd_export, exp_obd_chain);
1254 if (test_export(exp))
1257 /* don't count self-export as client */
1258 if (obd_uuid_equals(&exp->exp_client_uuid,
1259 &exp->exp_obd->obd_uuid))
1262 cfs_list_move(&exp->exp_obd_chain, &work_list);
1264 CDEBUG(D_ERROR, "%s: disconnect stale client %s@%s\n",
1265 obd->obd_name, exp->exp_client_uuid.uuid,
1266 exp->exp_connection == NULL ? "<unknown>" :
1267 libcfs_nid2str(exp->exp_connection->c_peer.nid));
1268 print_export_data(exp, "EVICTING", 0);
1270 cfs_spin_unlock(&obd->obd_dev_lock);
1273 CDEBUG(D_HA, "%s: disconnecting %d stale clients\n",
1274 obd->obd_name, evicted);
1275 obd->obd_stale_clients += evicted;
1277 class_disconnect_export_list(&work_list, exp_flags_from_obd(obd) |
1278 OBD_OPT_ABORT_RECOV);
1281 EXPORT_SYMBOL(class_disconnect_stale_exports);
1283 void class_fail_export(struct obd_export *exp)
1285 int rc, already_failed;
1287 cfs_spin_lock(&exp->exp_lock);
1288 already_failed = exp->exp_failed;
1289 exp->exp_failed = 1;
1290 cfs_spin_unlock(&exp->exp_lock);
1292 if (already_failed) {
1293 CDEBUG(D_HA, "disconnecting dead export %p/%s; skipping\n",
1294 exp, exp->exp_client_uuid.uuid);
1298 CDEBUG(D_HA, "disconnecting export %p/%s\n",
1299 exp, exp->exp_client_uuid.uuid);
1301 if (obd_dump_on_timeout)
1302 libcfs_debug_dumplog();
1304 /* Most callers into obd_disconnect are removing their own reference
1305 * (request, for example) in addition to the one from the hash table.
1306 * We don't have such a reference here, so make one. */
1307 class_export_get(exp);
1308 rc = obd_disconnect(exp);
1310 CERROR("disconnecting export %p failed: %d\n", exp, rc);
1312 CDEBUG(D_HA, "disconnected export %p/%s\n",
1313 exp, exp->exp_client_uuid.uuid);
1315 EXPORT_SYMBOL(class_fail_export);
1317 char *obd_export_nid2str(struct obd_export *exp)
1319 if (exp->exp_connection != NULL)
1320 return libcfs_nid2str(exp->exp_connection->c_peer.nid);
1324 EXPORT_SYMBOL(obd_export_nid2str);
1326 int obd_export_evict_by_nid(struct obd_device *obd, const char *nid)
1328 struct obd_export *doomed_exp = NULL;
1329 int exports_evicted = 0;
1331 lnet_nid_t nid_key = libcfs_str2nid((char *)nid);
1334 doomed_exp = cfs_hash_lookup(obd->obd_nid_hash, &nid_key);
1335 if (doomed_exp == NULL)
1338 LASSERTF(doomed_exp->exp_connection->c_peer.nid == nid_key,
1339 "nid %s found, wanted nid %s, requested nid %s\n",
1340 obd_export_nid2str(doomed_exp),
1341 libcfs_nid2str(nid_key), nid);
1342 LASSERTF(doomed_exp != obd->obd_self_export,
1343 "self-export is hashed by NID?\n");
1345 CWARN("%s: evict NID '%s' (%s) #%d at adminstrative request\n",
1346 obd->obd_name, nid, doomed_exp->exp_client_uuid.uuid,
1348 class_fail_export(doomed_exp);
1349 class_export_put(doomed_exp);
1352 if (!exports_evicted)
1353 CDEBUG(D_HA,"%s: can't disconnect NID '%s': no exports found\n",
1354 obd->obd_name, nid);
1355 return exports_evicted;
1357 EXPORT_SYMBOL(obd_export_evict_by_nid);
1359 int obd_export_evict_by_uuid(struct obd_device *obd, const char *uuid)
1361 struct obd_export *doomed_exp = NULL;
1362 struct obd_uuid doomed_uuid;
1363 int exports_evicted = 0;
1365 obd_str2uuid(&doomed_uuid, uuid);
1366 if (obd_uuid_equals(&doomed_uuid, &obd->obd_uuid)) {
1367 CERROR("%s: can't evict myself\n", obd->obd_name);
1368 return exports_evicted;
1371 doomed_exp = cfs_hash_lookup(obd->obd_uuid_hash, &doomed_uuid);
1373 if (doomed_exp == NULL) {
1374 CERROR("%s: can't disconnect %s: no exports found\n",
1375 obd->obd_name, uuid);
1377 CWARN("%s: evicting %s at adminstrative request\n",
1378 obd->obd_name, doomed_exp->exp_client_uuid.uuid);
1379 class_fail_export(doomed_exp);
1380 class_export_put(doomed_exp);
1384 return exports_evicted;
1386 EXPORT_SYMBOL(obd_export_evict_by_uuid);
1388 #if LUSTRE_TRACKS_LOCK_EXP_REFS
1389 void (*class_export_dump_hook)(struct obd_export*) = NULL;
1390 EXPORT_SYMBOL(class_export_dump_hook);
1393 static void print_export_data(struct obd_export *exp, const char *status,
1396 struct ptlrpc_reply_state *rs;
1397 struct ptlrpc_reply_state *first_reply = NULL;
1400 cfs_spin_lock(&exp->exp_lock);
1401 cfs_list_for_each_entry(rs, &exp->exp_outstanding_replies,
1407 cfs_spin_unlock(&exp->exp_lock);
1409 CDEBUG(D_HA, "%s: %s %p %s %s %d (%d %d %d) %d %d %d %d: %p %s "LPU64"\n",
1410 exp->exp_obd->obd_name, status, exp, exp->exp_client_uuid.uuid,
1411 obd_export_nid2str(exp), cfs_atomic_read(&exp->exp_refcount),
1412 cfs_atomic_read(&exp->exp_rpc_count),
1413 cfs_atomic_read(&exp->exp_cb_count),
1414 cfs_atomic_read(&exp->exp_locks_count),
1415 exp->exp_disconnected, exp->exp_delayed, exp->exp_failed,
1416 nreplies, first_reply, nreplies > 3 ? "..." : "",
1417 exp->exp_last_committed);
1418 #if LUSTRE_TRACKS_LOCK_EXP_REFS
1419 if (locks && class_export_dump_hook != NULL)
1420 class_export_dump_hook(exp);
1424 void dump_exports(struct obd_device *obd, int locks)
1426 struct obd_export *exp;
1428 cfs_spin_lock(&obd->obd_dev_lock);
1429 cfs_list_for_each_entry(exp, &obd->obd_exports, exp_obd_chain)
1430 print_export_data(exp, "ACTIVE", locks);
1431 cfs_list_for_each_entry(exp, &obd->obd_unlinked_exports, exp_obd_chain)
1432 print_export_data(exp, "UNLINKED", locks);
1433 cfs_list_for_each_entry(exp, &obd->obd_delayed_exports, exp_obd_chain)
1434 print_export_data(exp, "DELAYED", locks);
1435 cfs_spin_unlock(&obd->obd_dev_lock);
1436 cfs_spin_lock(&obd_zombie_impexp_lock);
1437 cfs_list_for_each_entry(exp, &obd_zombie_exports, exp_obd_chain)
1438 print_export_data(exp, "ZOMBIE", locks);
1439 cfs_spin_unlock(&obd_zombie_impexp_lock);
1441 EXPORT_SYMBOL(dump_exports);
1443 void obd_exports_barrier(struct obd_device *obd)
1446 LASSERT(cfs_list_empty(&obd->obd_exports));
1447 cfs_spin_lock(&obd->obd_dev_lock);
1448 while (!cfs_list_empty(&obd->obd_unlinked_exports)) {
1449 cfs_spin_unlock(&obd->obd_dev_lock);
1450 cfs_schedule_timeout_and_set_state(CFS_TASK_UNINT,
1451 cfs_time_seconds(waited));
1452 if (waited > 5 && IS_PO2(waited)) {
1453 LCONSOLE_WARN("%s is waiting for obd_unlinked_exports "
1454 "more than %d seconds. "
1455 "The obd refcount = %d. Is it stuck?\n",
1456 obd->obd_name, waited,
1457 cfs_atomic_read(&obd->obd_refcount));
1458 dump_exports(obd, 1);
1461 cfs_spin_lock(&obd->obd_dev_lock);
1463 cfs_spin_unlock(&obd->obd_dev_lock);
1465 EXPORT_SYMBOL(obd_exports_barrier);
1468 * kill zombie imports and exports
1470 void obd_zombie_impexp_cull(void)
1472 struct obd_import *import;
1473 struct obd_export *export;
1477 cfs_spin_lock(&obd_zombie_impexp_lock);
1480 if (!cfs_list_empty(&obd_zombie_imports)) {
1481 import = cfs_list_entry(obd_zombie_imports.next,
1484 cfs_list_del_init(&import->imp_zombie_chain);
1488 if (!cfs_list_empty(&obd_zombie_exports)) {
1489 export = cfs_list_entry(obd_zombie_exports.next,
1492 cfs_list_del_init(&export->exp_obd_chain);
1495 cfs_spin_unlock(&obd_zombie_impexp_lock);
1498 class_import_destroy(import);
1501 class_export_destroy(export);
1504 } while (import != NULL || export != NULL);
1508 static cfs_completion_t obd_zombie_start;
1509 static cfs_completion_t obd_zombie_stop;
1510 static unsigned long obd_zombie_flags;
1511 static cfs_waitq_t obd_zombie_waitq;
1512 static pid_t obd_zombie_pid;
1515 OBD_ZOMBIE_STOP = 1 << 1
1519 * check for work for kill zombie import/export thread.
1521 static int obd_zombie_impexp_check(void *arg)
1525 cfs_spin_lock(&obd_zombie_impexp_lock);
1526 rc = cfs_list_empty(&obd_zombie_imports) &&
1527 cfs_list_empty(&obd_zombie_exports) &&
1528 !cfs_test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags);
1530 cfs_spin_unlock(&obd_zombie_impexp_lock);
1536 * Add export to the obd_zombe thread and notify it.
1538 static void obd_zombie_export_add(struct obd_export *exp) {
1539 cfs_spin_lock(&exp->exp_obd->obd_dev_lock);
1540 LASSERT(!cfs_list_empty(&exp->exp_obd_chain));
1541 cfs_list_del_init(&exp->exp_obd_chain);
1542 cfs_spin_unlock(&exp->exp_obd->obd_dev_lock);
1543 cfs_spin_lock(&obd_zombie_impexp_lock);
1544 cfs_list_add(&exp->exp_obd_chain, &obd_zombie_exports);
1545 cfs_spin_unlock(&obd_zombie_impexp_lock);
1547 if (obd_zombie_impexp_notify != NULL)
1548 obd_zombie_impexp_notify();
1552 * Add import to the obd_zombe thread and notify it.
1554 static void obd_zombie_import_add(struct obd_import *imp) {
1555 LASSERT(imp->imp_sec == NULL);
1556 cfs_spin_lock(&obd_zombie_impexp_lock);
1557 LASSERT(cfs_list_empty(&imp->imp_zombie_chain));
1558 cfs_list_add(&imp->imp_zombie_chain, &obd_zombie_imports);
1559 cfs_spin_unlock(&obd_zombie_impexp_lock);
1561 if (obd_zombie_impexp_notify != NULL)
1562 obd_zombie_impexp_notify();
1566 * notify import/export destroy thread about new zombie.
1568 static void obd_zombie_impexp_notify(void)
1570 cfs_waitq_signal(&obd_zombie_waitq);
1574 * check whether obd_zombie is idle
1576 static int obd_zombie_is_idle(void)
1580 LASSERT(!cfs_test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags));
1581 cfs_spin_lock(&obd_zombie_impexp_lock);
1582 rc = cfs_list_empty(&obd_zombie_imports) &&
1583 cfs_list_empty(&obd_zombie_exports);
1584 cfs_spin_unlock(&obd_zombie_impexp_lock);
1589 * wait when obd_zombie import/export queues become empty
1591 void obd_zombie_barrier(void)
1593 struct l_wait_info lwi = { 0 };
1595 if (obd_zombie_pid == cfs_curproc_pid())
1596 /* don't wait for myself */
1598 l_wait_event(obd_zombie_waitq, obd_zombie_is_idle(), &lwi);
1600 EXPORT_SYMBOL(obd_zombie_barrier);
1605 * destroy zombie export/import thread.
1607 static int obd_zombie_impexp_thread(void *unused)
1611 if ((rc = cfs_daemonize_ctxt("obd_zombid"))) {
1612 cfs_complete(&obd_zombie_start);
1616 cfs_complete(&obd_zombie_start);
1618 obd_zombie_pid = cfs_curproc_pid();
1620 while(!cfs_test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags)) {
1621 struct l_wait_info lwi = { 0 };
1623 l_wait_event(obd_zombie_waitq,
1624 !obd_zombie_impexp_check(NULL), &lwi);
1625 obd_zombie_impexp_cull();
1628 * Notify obd_zombie_barrier callers that queues
1631 cfs_waitq_signal(&obd_zombie_waitq);
1634 cfs_complete(&obd_zombie_stop);
1639 #else /* ! KERNEL */
1641 static cfs_atomic_t zombie_recur = CFS_ATOMIC_INIT(0);
1642 static void *obd_zombie_impexp_work_cb;
1643 static void *obd_zombie_impexp_idle_cb;
1645 int obd_zombie_impexp_kill(void *arg)
1649 if (cfs_atomic_inc_return(&zombie_recur) == 1) {
1650 obd_zombie_impexp_cull();
1653 cfs_atomic_dec(&zombie_recur);
1660 * start destroy zombie import/export thread
1662 int obd_zombie_impexp_init(void)
1666 CFS_INIT_LIST_HEAD(&obd_zombie_imports);
1667 CFS_INIT_LIST_HEAD(&obd_zombie_exports);
1668 cfs_spin_lock_init(&obd_zombie_impexp_lock);
1669 cfs_init_completion(&obd_zombie_start);
1670 cfs_init_completion(&obd_zombie_stop);
1671 cfs_waitq_init(&obd_zombie_waitq);
1675 rc = cfs_kernel_thread(obd_zombie_impexp_thread, NULL, 0);
1679 cfs_wait_for_completion(&obd_zombie_start);
1682 obd_zombie_impexp_work_cb =
1683 liblustre_register_wait_callback("obd_zombi_impexp_kill",
1684 &obd_zombie_impexp_kill, NULL);
1686 obd_zombie_impexp_idle_cb =
1687 liblustre_register_idle_callback("obd_zombi_impexp_check",
1688 &obd_zombie_impexp_check, NULL);
1694 * stop destroy zombie import/export thread
1696 void obd_zombie_impexp_stop(void)
1698 cfs_set_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags);
1699 obd_zombie_impexp_notify();
1701 cfs_wait_for_completion(&obd_zombie_stop);
1703 liblustre_deregister_wait_callback(obd_zombie_impexp_work_cb);
1704 liblustre_deregister_idle_callback(obd_zombie_impexp_idle_cb);